Evaluation of the psychometric properties of the HIV Disability Questionnaire among adults living with HIV in the United Kingdom: A cross-sectional self-report measurement study

PLoS One. 2019 Jul 10;14(7):e0213222. doi: 10.1371/journal.pone.0213222. eCollection 2019.

Abstract

Objective: To evaluate the psychometric properties of the HIV Disability Questionnaire (HDQ) among people living with HIV (PLHIV) in London, United Kingdom (UK).

Methods: This is a cross-sectional measurement study. We recruited and administered the self-reported HDQ, seven criterion measures, and a demographic questionnaire with adults living with HIV accessing HIV care. We determined median and interquartile ranges (IQR) for disability presence, severity and episodic scores (range 0-100). We calculated Cronbach's alpha (α) Kuder-Richardson-20 (KR-20) statistics for disability and episodic scores respectively (internal consistency reliability), smallest detectable change (SDC) for each HDQ severity item and domain (precision), and tested 36 a priori hypotheses assessing correlations between HDQ and criterion scores (construct validity).

Results: Of N = 243 participants, all were male, median age 40 years, 94% currently taking antiretroviral therapy, and 22% living with ≥2 concurrent health conditions. Median HDQ domain scores ranged from 0 (IQR: 0,7) (difficulties with day-to-day activities domain) to 27 (IQR: 14, 41) (uncertainty domain). Cronbach's alpha for the HDQ severity scale ranged from 0.85 (95% Confidence Interval (CI): 0.80-0.90) in the cognitive domain to 0.93 (95%CI: 0.91-0.94) in the mental-emotional domain. The KR-20 statistic for the HDQ episodic scale ranged from 0.74 (95%CI: 0.66-0.83) in the cognitive domain to 0.91 (95%CI: 0.89-0.94) in the uncertainty domain. SDC ranged from 7.3-15.0 points on the HDQ severity scale for difficulties with day-to-day activities and cognitive symptoms domains, respectively. The majority of the construct validity hypotheses (n = 30/36, 83%) were confirmed.

Conclusions: The HDQ possesses internal consistency reliability and construct validity with varied precision when administered to males living with HIV in London, UK. Clinicians and researchers may use the HDQ to measure the nature and extent of disability experienced by PLHIV in the UK, and to inform HIV service provision to address the health-related challenges among PLHIV.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Cross-Sectional Studies
  • Disability Evaluation*
  • HIV Infections / drug therapy
  • HIV Infections / physiopathology
  • HIV Infections / psychology*
  • Humans
  • London
  • Male
  • Middle Aged
  • Psychometrics
  • Reproducibility of Results
  • Self Report / statistics & numerical data
  • Surveys and Questionnaires* / statistics & numerical data

Grants and funding

We gratefully acknowledge the British Academy Fellowship of Humanities and Social Sciences awarded to RH and KKO'B, which supported this study (VF1\102954)(www.thebritishacademy.ac.uk). KKO'B is supported by a Canada Research Chair in Episodic Disability and Rehabilitation (www.chairs-chaires.gc.ca/chairholders-titulaires/profile-eng.aspx?profileId=4394). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.